Vehicle Door Bracket Offset Welding Lines
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Solution Overview
Problem
Vehicle door frames with belt-line reinforcement members require high buckling strength and heat-distortion resistance at joints, which are challenging to achieve at a low cost with existing designs.
Innovation Solution
A vehicle door frame design featuring a bracket welded to the belt-line reinforcement member at multiple non-coincident welding lines, with these lines offset in the lengthwise direction and nonparallel to each other, enhancing joint strength and resistance to heat distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bracket is welded to the belt-line reinforcement member at a single welding joint, then the structure is simple and manufacturing is easy, but the joint has insufficient buckling strength and heat-distortion resistance
Solution Approach 1:
The welding joint is segmented into multiple welding portions (first welding portion and second welding portion) instead of using a single continuous weld. This segmentation distributes the stress and heat, improving both the buckling strength and heat-distortion resistance of the joint while maintaining manufacturing simplicity
Solution Approach 2:
The welding portions are arranged in different spatial dimensions - the first welding portion is positioned at a first position in the lengthwise direction and the second welding portion is positioned at a second position in the lengthwise direction. This dimensional arrangement creates offset welding lines that enhance structural strength without complicating the welding process
2Reliability
If multiple welding portions are used to increase joint strength, then buckling strength and heat-distortion resistance improve, but the welding process becomes more complex and costly
Solution Approach 1:
The welding joint is divided into multiple discrete welding portions that can be executed separately. This segmentation allows for better heat control and reduced heat distortion while maintaining ease of manufacture through standardized welding procedures at each portion
Solution Approach 2:
The welding portions are pre-positioned at specific locations along the bracket and belt-line reinforcement member. This preliminary positioning of welding portions allows for optimized heat distribution and reduced heat distortion while keeping the manufacturing process straightforward
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves high strength and resistance to bending forces and heat distortion at the joint between the belt-line reinforcement member and the bracket, while maintaining a simple and cost-effective structure.
Implementation Method 1
The bracket is welded to the belt-line reinforcement member at a plurality of welding portions, each of the welding portions defining a welding line
Data Source
AI summary
A vehicle door frame includes a door sash, a belt-line reinforcement member, and a bracket which connects the door sash and the belt-line reinforcement member to each other and is fixed to a door panel. The bracket is welded to the belt-line reinforcement member at a plurality of welding portions, each of the welding portions defining a welding line, where an extension of each of the welding lines are not aligned with one another.